Bug#743477: Easy fix

[Laurent Martelli]

Hello,

I encountered this situation, and I it turned I indeed had grub 
installed on my two harddrives but the Debian package was only 
configured to install on one of them. So the easy solution was to boot 
on the other harddrive (using BIOS boot menu), and then reconfigure 
grub-pc to install grub on both disks : dpkg-reconfigure grub-pc.

Bests,
Laurent